© Copyright 2019 WIZnet Co., Ltd. All rights reserved.

WizFi360 Hardware Design Guide

(Version 1.03)

http://www.wiznet.io

2 / 14 WizFi360 Hardware Design Guide

Document Revision History

Date Revision Changes

2019-09-02 1.0 Initial Release

2019-09-03 1.01 Edited “Figure 6. UART Level Shifter”

2019-09-20 1.02 Added “4. PCB Footprint”

Edited “Figure 2. Reference Schematic”

2019-11-27 1.03

Edited “Figure 1. WizFi360 Pinout”

Edited “Table 1. Pin Definitions”

Added “3.4 SPI”

WizFi360 Hardware Design Guide 3 / 14

Table of Contents

1. Overview ............................................................................................................................................................................................. 4

2. Pin Definitions ................................................................................................................................................................................. 4

2.1. Initial Value of GPIO Pins ............................................................................................................................................. 6

3. Circuit ................................................................................................................................................................................................... 7

3.1. System .................................................................................................................................................................................... 7

3.2. Power....................................................................................................................................................................................... 8

3.3. UART ....................................................................................................................................................................................... 8

3.4. SPI ............................................................................................................................................................................................. 9

3.5. ETC ............................................................................................................................................................................................ 9

4. PCB Footprint.................................................................................................................................................................................11

5. PCB layout .......................................................................................................................................................................................12

4 / 14 WizFi360 Hardware Design Guide

1. Overview

This document is the WizFi360 hardware design guide. If you are designing hardware using the WizFi360 you

must refer to this document. This document includes a reference circuit diagram and a PCB guide.

2. Pin Definitions

RSTNCPA0WPPA1PB6PB9VCC

TXD1RXD1

LEDRXD0TXD0PB10GND

PB15

PB18

PB14

PB17

PB16

SPI_INTn

SPI_MISO

SPI_CSn

SPI_CLK

SPI_MOSI

CTS1 RTS1

I2C_SCLI2C_SDA

PB8PB7

DEFAUT

BOOT

SPI_EN

Figure 1. WizFi360 Pinout

No Pin Name Type Pin Function

1 RST I Module Reset Pin (Active Low)

2 NC - Reserved

3 PA0 I/O

BOOT Pin (Active low)

When power on or reset is low, it operates in Boot mode.

In the normal operating mode, this pin can be controlled by AT command.

4 WP I

WAKE-UP Pin (Active High)

If the wake-up pin is high in Standby mode, the WizFi360 is reset to the normal

operating mode.

5 PA1 I

Pull down over 3s for taking effect.

UART1's current parameter changes to default value (please refer to the

AT+UART_CUR command in WizFi360 AT command manual).

WizFi360 Hardware Design Guide 5 / 14

6 PB6 I/O This pin can be controlled by AT command.

7 PB9 I CTS Pin of UART1

If you don't use the CTS function, this pin can be controlled by AT command.

8 VCC P Power Pin (Typical Value 3.3V)

9 PB15 I/O CSn Pin of SPI

If you don't use the SPI function, this pin can be controlled by AT command.

10 PB18 I/O MISO Pin of SPI

If you don't use the SPI function, this pin can be controlled by AT command.

11 PB13

/ SPI_EN I/O

Enable Pin of SPI

When power is applied or reset, this pin is checked to set the module mode.

Low or NC – UART Mode (Default)

High – SPI Mode

12 PB14 I/O INTn Pin of SPI

If you don't use the SPI function, this pin can be controlled by AT command.

13 PB17 I/O MOSI Pin of SPI

If you don't use the SPI function, this pin can be controlled by AT command.

14 PB16 I/O CLK Pin of SPI

If you don't use the SPI function, this pin can be controlled by AT command.

15 GND I/O Ground Pin

16 PB10 O RTS Pin of UART1

If you don't use the RTS function, this pin can be controlled by AT command.

17 TXD0 O TXD Pin of UART0

18 RXD0 I RXD Pin of UART0

19 PB7 O

LED Light output (Active low). Go to Low while each TX/RX packet and then back to

high.

Note: It has been connected to onboard LED for WizFi360-PA

20 PB8 I/O This pin can be controlled by AT command.

21 RXD1 I RXD Pin of UART1

22 TXD1 O TXD Pin of UART1

Table 1. Pin Definitions

*Note: UART1 is used for AT command and data communication. UART0 is used for debugging and firmware

upgrade.

6 / 14 WizFi360 Hardware Design Guide

2.1. Initial Value of GPIO Pins

This is the initial value of GPIO when using AT command to use GPIO on the WizFi360.

Pin Name Initial Mode Initial Value

PA0 I High

PB6 O Low

PB9 O Low

PB15 O Low

PB18 O Low

PB14 O Low

PB17 O Low

PB16 O Low

PB10 O Low

PB07 O Low

PB08 O Low

Table 2. Initial Value of GPIO Pins

WizFi360 Hardware Design Guide 7 / 14

3. Circuit

3.1. System

The WizFi360 has a very simple circuit. You can connect power to the WizFi360 and send and receive data

through UART1. And you have to pay attention to the four pins.

Figure 2. Reference Schematic

⚫ Reset

Reset circuit offers to design with RC circuit. WizFi360 reset automatically by low level power. If RESET pin

controlled by external circuit, the WizFi360 will reset when the level is below 2.0V. The low level needs to last

more than 100µs.

⚫ PA0

PA0 circuit offers to design 10k pull-up. PA0 is used as a boot pin, but it's use unlikely for normal users. This

pin is used at the factory stage. (Module production)

⚫ PA1

PA1 circuit offers to design 10k pull-up. If PA1 is Low for 3 seconds, UART1's current parameter changes to default

value (please refer to the AT+UART_CUR command in WizFi360 AT command manual).

8 / 14 WizFi360 Hardware Design Guide

⚫ WP

WP circuit offers to design user configuration. You must control this pin if you are using standby mode. If this

pin is high in Standby mode, the WizFi360 is reset to the normal operating mode.

3.2. Power

WizFi360 requires the use of a power supply capable of supplying 3.0V to 3.6V and more than 500mA.

Because WizFi360 operates normally from 3.0V to 3.6V, it consumes up to 230mA of instantaneous current.

The wiring width should not be less than 30mil.

The power stabilizing capacitor (100nF) should be placed close to the VCC pin.

3.3. UART

The WizFi360 supports UART communication mode. When the power is turned on or reset, If the PB13 pin

remains High or NC, it operates in UART communication mode.

Figure 3. UART

⚫ UART1

UART1 is the main communication UART. AT command communication is possible with UART1 and data

communication is possible.

⚫ UART0

WizFi360 Hardware Design Guide 9 / 14

UART0 is not available to normal users. This UART is used at the factory stage (Module production) and

intended for internal firmware developers of the WizFi360.

3.4. SPI

The WizFi360 supports SPI communication mode. When the power is turned on or reset, If the

PB13(SPI_EN) pin remains low, it operates in SPI communication mode.

Figure 4. SPI Interface

3.5. ETC

This session is an additional circuit guide for using the WizFi360. You don't have to keep this session. But

if you need it, you design it.

⚫ UART Flow Control

If you want to use UART Flow Control, you need to design a circuit as shown in Figure 3. PB9 is CTS1,

PB10 is RTS1.

10 / 14 WizFi360 Hardware Design Guide

Figure 5. UART Flow Control

⚫ UART Level Shifter

The UART voltage on the WizFi360 is 3.3V. However, your MCU may not have a voltage of 3.3V. If so you

need a Level Shifter to connect the WizFi360 to your MCU. You can design a Level Shifter circuit by

referring to Figure 4. Connect your MCU’s UART voltage to the VCCIO at Figure 4.

Figure 6. UART Level Shifter

WizFi360 Hardware Design Guide 11 / 14

4. PCB Footprint

Figure 7. Recommended PCB Land Pattern of WizFi360

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5. PCB layout

⚫ Power wiring width should not be less than 30mil.

⚫ Except for the antenna portion of WizFi360, the bottom layer of the shield can must have a GND

plane.

Figure 8. GND

⚫ Figures. 6 and Figures. 7 are 2 antenna placement which can best performance of antenna. We

suggest customers to choose one of these 2 modes to design the placement. For the second

placement mode, PCB antenna should be at least 5.0mm from both sides of the bottom board.

6mm

Figure 9. Best Placement 1

WizFi360 Hardware Design Guide 13 / 14

6mm

5mm 5mm

Figure 10. Best Placement 2

14 / 14 WizFi360 Hardware Design Guide

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